Bicycle Valve Types Explained: Presta, Schrader, and Removable Valve Cores

Introduction: It’s Just Pumping Air, Why Is It So Complicated?

One of the most awkward moments in life: you get a flat by the roadside, a kind cyclist stops to lend you their pump, you gratefully take it — only to find the pump head doesn’t match your valve.

Why isn’t there just one universal bicycle valve standard? Because the world is complicated like that. But don’t worry, by the end of this article, you’ll be a valve expert.

Main Valve Types

Presta Valve

Also known as the French valve or “skinny valve.”

Feature	Description
Appearance	Thin and long, with a small locknut on top
Diameter	6mm
Common on	Road bikes, mid-to-high-end mountain bikes
Max pressure	Up to 120+ PSI
Pros	Lightweight, stable at high pressure, good air seal
Cons	More fragile, locknut must be opened first

How to use:

1. Turn the small locknut on top counterclockwise to open it
2. Press it lightly once to release a bit of air (confirm it’s clear)
3. Attach the pump head
4. Pump to the target pressure
5. Remove the pump head
6. Turn the locknut clockwise to tighten it

Schrader Valve

Also known as the American valve or “fat valve.”

Feature	Description
Appearance	Short and thick, same as a car tire valve
Diameter	8mm
Common on	Mountain bikes, commuter bikes, kids’ bikes
Max pressure	Usually up to 60 PSI
Pros	Durable, can be inflated at any gas station
Cons	Heavier, takes up more space

How to use:

1. Remove the dust cap
2. Attach the pump head directly
3. Pump
4. Remove the pump head
5. Put the dust cap back on

Dunlop Valve (Woods Valve)

Also known as the English valve.

Feature	Description
Appearance	Thickness between Presta and Schrader
Diameter	8mm (same as Schrader)
Common on	Japanese bikes, European commuter bikes
Max pressure	Usually up to 50 PSI
Pros	Cheap, can use a Schrader pump
Cons	Poor air seal, rare in Taiwan

In Taiwan: Dunlop valves are almost only found on very old bicycles; modern bikes essentially don’t use them anymore.

Presta vs Schrader: Detailed Comparison

Comparison	Presta	Schrader
Diameter	6mm	8mm
Weight	Lighter	Heavier
Strength	More fragile	Sturdier
Max pressure	120+ PSI	60-80 PSI
Gas station pumping	Adapter required	Direct use
Inner tube selection	More options (road bikes)	More options (mountain bikes)
Removable valve core	Some models	Almost all
Rim hole diameter	6.5mm	8.5mm

Why Do Road Bikes Use Presta Valves?

1. Rim strength: Presta valves need a smaller hole (6.5mm vs 8.5mm), which has less impact on the rim’s structure
2. High-pressure needs: Road bike tire pressure is typically 80-120 PSI, and the Presta valve’s sealing design suits high pressure better
3. Weight: A few grams saved per valve adds up across the whole bike

Removable Valve Cores

What Is a Removable Valve Core?

Some Presta valves have a valve core beneath the top locknut that can be unscrewed. A removable valve core lets you:

1. Replace a damaged valve core: No need to replace the whole inner tube
2. Inject sealant: Essential for tubeless systems
3. Clean the valve: Remove it, clean it, and put it back
4. Install a valve extender: Needed for deep-section wheels

How to Tell If It’s Removable?

• Removable: Can be unscrewed with a valve core tool (or small needle-nose pliers)
• Fixed: Cannot be unscrewed, it’s molded as one piece with the valve stem

Note: Always deflate the tire before removing the valve core! Otherwise the valve core can shoot out like a bullet.

Valve Core Tools

Tool	Price	Notes
Dedicated valve core tool	NT$50-100	Most convenient
Included with multi-function pumps	NT$0 (comes with the pump)	Many pumps include one
Small needle-nose pliers	NT$50	Alternative option

Valve Extenders

Why Do You Need an Extender?

On deep-section wheels (50mm or more), the rim depth exceeds the standard valve length, so the pump head can’t fully attach. In this case, you have two options:

1. Buy an inner tube with a long valve: Get one with a 60mm or 80mm valve stem directly
2. Use a valve extender: Attach it to your existing valve to add length

Extender Types

Type	Pros	Cons
Threaded (requires removable valve core)	Good seal, secure	Requires a removable valve core
Push-fit	No removable valve core needed	May leak air

Threaded installation:

1. Unscrew the existing valve core
2. Screw the extender onto the valve
3. Install the valve core into the top of the extender
4. Pump as usual

Tubeless Valves

Features of Tubeless Valves

Feature	Description
Base	Has a rubber sealing washer
Material	Aluminum alloy or brass
Valve core	Must be removable (for injecting sealant)
Installation	Passes through from inside the rim, secured with a nut

Tubeless Valve Maintenance

1. Check the sealing washer regularly: Rubber degrades over time; replace it annually
2. Clean the valve core: Sealant can clog the valve core, so remove and clean it periodically
3. Check the nut tightness: Not too tight (it can crush the sealing washer) and not too loose
4. Keep a spare valve core: For quick replacement when sealant clogs it

Pump Buying Guide

Floor Pumps

Brand	Model	Valve Support	Price	Feature
Lezyne	Steel Drive	Presta/Schrader	NT$2,000	Precise pressure gauge
Topeak	JoeBlow Sport III	Presta/Schrader	NT$1,200	Great value
Giyo	GF-55	Presta/Schrader	NT$500	Affordable and practical
BETO	CMP-069	Presta/Schrader	NT$600	Taiwanese brand

Portable Pumps

Brand	Model	Valve Support	Price	Feature
Lezyne	Pressure Drive	Presta/Schrader	NT$1,200	Compact and high pressure
Topeak	RaceRocket HP	Presta/Schrader	NT$800	Lightweight and easy to use
Giyo	GP-04S	Presta/Schrader	NT$300	Cheap and reliable

Taiwan recommendation: Giyo is a Taiwanese brand with stable quality and affordable prices — the best value for money.

Presta-to-Schrader Adapter

If you use a Presta valve but need to inflate at a gas station:

• Adapter price: NT$15-30
• Recommended to carry one with you
• Available at PX Mart, hardware stores, and bike shops
• Install it on the Presta valve to use a Schrader pump

Frequently Asked Questions

Q: Can a Presta valve be converted to a Schrader valve?
A: No, because the rim hole sizes are different. Presta is 6.5mm, Schrader is 8.5mm.

Q: Why does air leak out while pumping?
A: With a Presta valve, you need to open the top locknut first; the pump head must fully seat onto the valve or it will leak.

Q: Can I still use a Presta valve if the locknut falls off?
A: Yes, but it’s recommended to replace it. The locknut is a key part for sealing air.

Q: Can a gas station air pump be used on a bicycle?
A: Schrader valves can be used directly, but be careful — too much pressure can cause a blowout. Presta valves need an adapter.

Conclusion

Small as it is, the valve is the most important interface between you and your tire. Understand the characteristics and usage of different valve types, carry an adapter with you, and you’ll never be stuck on the roadside unable to inflate your tire again.

Oh, and remember to check your tire pressure before you head out. A lot of problems start with underinflated tires.

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